Product manual

Industrial Grade SD Card Interface Description
3-24 SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION
Table 3-29. Industrial Grade SD Card Status
Bits Identifier Type Value Description Clear
Cond.
511:
510
DAT_BUS_WIDTH S R ‘00’=1 (default)
‘01’=reserved
‘10’=4 bit width
‘11’=reserved
Shows the currently defined
data bus width that was
defined by the
SET_BUS_WIDTH command.
A
509 SECURED_MODE S R ‘0’=not in the mode
‘1’=in secured mode
Card is in Secured Mode of
operation (refer to the SD
Security Specifications
document).
A
508:
496
Reserved
495:
480
SD_CARD_TYPE S R ‘00xxh’=SD Memory Cards
as defined in Physical
Spec. Ver. 1.01
(‘x’=don’t care).
The following cards
are currently defined:
‘0000’=Regular SD
RD/WR Card.
‘0001’=SD ROM Card
In the future, the 8 LSBs will
be used to define different
variations of an SD Card (each
bit will define different SD
types). The 8 MSBs will be
used to define SD cards that
do not comply with the SD
Memory Card as defined in the
Specification Ver. 1.01
A
479:
448
SIZE_OF_PROTECTED_AREA S R Size of protected area (in
units of
MULT*BLOCK_LEN
refer to CSD register.
Shows the size of the
protected area. The actual
area =
(SIZE_OF_PROTECTED_A
REA) * MULT *
BLOCK_LEN.
A
447:
312
Reserved
311:
0
Reserved for Manufacturer
3.5.7. RCA Register
The 16-bit relative card address register carries the card address that is published by the card during the card
identification. This address is used for the addressed host-card communication after the card identification
procedure.
3.5.8. Industrial Grade SD Card Registers in SPI Mode
In SPI mode, all the card’s registers are accessible. Their format is identical to the format in the SD Card mode.
However, a few fields are irrelevant in SPI mode. In SPI mode, the card status register has a different, shorter,
format as well. Refer to the SPI Protocol section for more details.